<template>
	<div class="shopcart">
		<div class="content" @click="toggleList">
			<div class="content-left">
				<div class="logo-wrapper">
					<div class="logo" :class="{'highlight':totalCount > 0}">
						<i class="icon-shopping_cart" :class="{'highlight':totalCount > 0}"></i>
					</div>
					<div class="num" v-show="totalCount > 0">{{totalCount}}</div>
				</div>
				<div class="price" :class="{'highlight':totalPrice > 0}">￥{{totalPrice}}</div>
				<div class="desc">另需配送费￥{{deliveryPrice}}元</div>
			</div>
			<div class="content-right" @click.stop.prevent="pay">
				<div class="pay" :class="payClass">{{payDesc}}</div>
			</div>
		</div>
		<div class="ball-container">
			<div transition="drop" v-for="ball in balls" v-show="ball.show" class="ball">
				<div class="inner inner-hook"></div>
			</div>
		</div>
		<div class="shopcart-list" v-show="listShow" transition="fold">
			<div class="list-header">
				<h1 class="title">购物车</h1>
				<span class="empty" @click="empty">清空</span>
			</div>
			<div class="list-content" v-el:list-content>
				<ul>
					<li class="food border-1px" v-for="food in selectFoods">
						<span class="name">{{food.name}}</span>
						<div class="price">
							<span>￥{{food.price * food.count}}</span>
						</div>
						<div class="cartcontrol-wrapper">
							<cartcontrol :food="food"></cartcontrol>
						</div>
					</li>
				</ul>
			</div>
		</div>
	</div>
	<div class="list-mask" v-show="listShow" @click="hideList" transition="fade"></div>
</template>
<script>
	import BScroll from 'better-scroll';
	import cartcontrol from 'components/cartcontrol/cartcontrol';
	export default {
		props: {
			selectFoods: {
				type: Array,
				default () {
					return [
						{
							count: 0,
							price: 0
						}
					];
				}
			},
			deliveryPrice: {
				type: Number,
				default: 0
			},
			minPrice: {
				type: Number,
				default: 0
			}
		},
		data () {
			return {
				balls: [
					{
						show: false
					},
					{
						show: false
					},
					{
						show: false
					},
					{
						show: false
					},
					{
						show: false
					}
				],
				dropBalls: [],
				fold: true
			};
		},
		computed: {
			totalPrice () {
				let total = 0;
				this.selectFoods.forEach((food) => {
					total += food.price * food.count;
				});
				return total;
			},
			totalCount () {
				let count = 0;
				this.selectFoods.forEach((food) => {
					count += food.count;
				});
				return count;
			},
			payDesc () {
				if (this.totalPrice === 0) {
					return `￥${this.minPrice}元起送`;
				} else if (this.totalPrice < this.minPrice) {
					let diff = this.minPrice - this.totalPrice;
					return `还差￥${diff}元起送`;
				} else {
					return '去结算';
				}
			},
			payClass () {
				if (this.totalPrice < this.minPrice) {
					return 'no-enough';
				} else {
					return 'enough';
				}
			},
			listShow () {
				if (!this.totalCount) {
					this.fold = true;
					return false;
				}
				let show = !this.fold;
				if (show) {
					this.$nextTick(() => {
						if (!this.scroll) {
							this.scroll = new BScroll(this.$els.listContent, {
								click: true
							});
						} else {
							this.scroll.refresh();
						}
					});
				}
				return show;
			}
		},
		methods: {
			drop (el) {
				for (let i = 0; i < this.balls.length; i++) {
					let ball = this.balls[i];
					if (!ball.show) {
						ball.show = true;
						ball.el = el;
						this.dropBalls.push(ball);
						return;
					}
				}
			},
			toggleList () {
				if (!this.totalCount) {
					return;
				}
				this.fold = !this.fold;
			},
			empty () {
				this.selectFoods.forEach((food) => {
					food.count = 0;
				});
			},
			hideList () {
				this.fold = true;
			},
			pay () {
				if (this.totalPrice < this.minPrice) {
					return;
				}
				window.alert(`支付${this.totalPrice}元`);
			}
		},
		transitions: {
			drop: {
				beforeEnter (el) {
					let count = this.balls.length;
					while (count--) {
						let ball = this.balls[count];
						if (ball.show) {
							let rect = ball.el.getBoundingClientRect();
							let x = rect.left - 32;
							let y = -(window.innerHeight - rect.top - 22);
							el.style.display = '';
							el.style.webkitTransform = `translate3d(0,${y}px,0)`;
							el.style.transform = `translate3d(0,${y}px,0)`;
							let inner = el.getElementsByClassName('inner-hook')[0];
							inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
							inner.style.transform = `translate3d(${x}px,0,0)`;
						}
					}
				},
				enter (el) {
					/* eslint-disable no-unused-vars */
					let rf = el.offsetHeight;
					this.$nextTick(() => {
						el.style.webkitTransform = 'translate3d(0,0,0)';
						el.style.transform = 'translate3d(0, 0, 0)';
						let inner = el.getElementsByClassName('inner-hook')[0];
						inner.style.webkitTransform = 'translate3d(0,0,0)';
						inner.style.transform = 'translate3d(0,0,0)';
					});
				},
				afterEnter (el) {
					let ball = this.dropBalls.shift();
					if (ball) {
						ball.show = false;
						el.style.display = 'none';
					}
				}
			}
		},
		components: {
			cartcontrol
		}
	};
</script>
<style lang="scss" rel="stylesheet/scss">
	@import '../../common/sass/mixin.scss';
	.shopcart{
		position: fixed;
		left: 0;
		bottom: 0;
		z-index: 50;
		width: 100%;
		height: 48px;
		.content{
			display: flex;
			background: #141d27;
			font-size: 0;
			.content-left{
				flex: 1;
				.logo-wrapper{
					display: inline-block;
					position: relative;
					top: -10px;
					margin: 0 12px;
					padding: 6px;
					width: 56px;
					height: 56px;
					box-sizing: border-box;
					vertical-align: top;
					border-radius: 50%;
					background: #141d27;
					.logo{
						width: 100%;
						height: 100%;
						text-align: center;
						border-radius: 50%;
						background: #2b343c;
						&.highlight{
							background: rgb(0, 160, 220)
						}
						.icon-shopping_cart{
							line-height: 44px;
							font-size: 24px;
							color: #80858a;
							&.highlight{
								color: #fff;
							}
						}
					}
					.num{
						position: absolute;
						top: 0;
						right: 0;
						width: 24px;
						height: 16px;
						line-height: 16px;
						text-align: center;
						border-radius: 16px;
						font-size: 9px;
						font-weight: 700;
						color: #fff;
						background: rgb(240, 20, 20);
						box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4);
					}
				}
				.price{
					display: inline-block;
					vertical-align: top;
					margin-top: 12px;
					line-height: 24px;
					padding-right: 12px;
					box-sizing: border-box;
					border-right: 1px solid rgba(255, 255, 255, 0.1);
					font-size: 16px;
					font-weight: 700;
					color: rgba(255, 255, 255, 0.4);
					&.highlight{
						color: #fff;
					}
				}
				.desc{
					display: inline-block;
					vertical-align: top;
					line-height: 24px;
					margin: 12px 0 0 12px;
					color: rgba(255, 255, 255, 0.4);
					font-size: 10px;
				}
			}
			.content-right{
				flex: 0 0 105px;
				width: 105px;
				.pay{
					height: 48px;
					line-height: 48px;
					text-align: center;
					font-size: 12px;
					font-weight: 700;
					color: rgba(255, 255, 255, 0.4);
					background: #2b333b;
					&.not-enough{
						background: #2b333b;
					}
					&.enough{
						background: #00b43c;
						color: #fff;
					}
				}
			}
		}
		.ball-container{
			.ball{
				position: fixed;
				left: 32px;
				bottom: 22px;
				z-index: 200;
				&.drop-transition{
					transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41);
					.inner{
						width: 16px;
						height: 16px;
						border-radius: 50%;
						background: rgb(0, 160, 220);
						transition: all 0.4s linear;
					}
				}
			}
		}
		.shopcart-list{
			position: absolute;
			left: 0;
			top: 0;
			z-index: -1;
			width: 100%;
			&.fold-transition{
				transition: all 0.5s;
				transform: translate3d(0,-100%,0);
			}
			&.fold-enter,&.fold-leave{
				transform: translate3d(0,0,0);
			}
			.list-header{
				height: 40px;
				line-height: 40px;
				padding: 0 18px;
				background: #f3f5f7;
				border-bottom: 1px solid rgba(7, 17, 27, 0.1);
				.title{
					float: left;
					font-size: 14px;
					color: rgb(7, 17, 27);
				}
				.empty{
					float: right;
					font-size: 12px;
					color: rgb(0, 160, 220);
				}
			}
			.list-content{
				padding: 0 18px;
				max-height: 217px;
				overflow:hidden;
				background: #fff;
				.food{
					position: relative;
					padding: 12px 0;
					box-sizing: border-box;
					@include border-1px(rgba(7, 17, 27, 0.1));
					.name{
						line-height: 24px;
						font-size: 14px;
						color: rgb(7, 17, 27);
					}
					.price{
						position: absolute;
						right: 90px;
						bottom: 12px;
						line-height: 24px;
						font-size: 14px;
						font-weight: 700;
						color: rgb(240, 20, 20);
					}
					.cartcontrol-wrapper{
						position: absolute;
						right: 0;
						bottom: 6px;
					}
				}
			}
		}
	}
	.list-mask{
		position: fixed;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		z-index: 40;
		backdrop-filter: blur(10px);
		&.fade-transition{
			transition: all 0.5s;
			opacity: 1;
			background: rgba(7,17,27,0.6);
		}
		&.fade-enter,&.fade-leave{
			opacity: 0;
			background: rgba(7,17,27,0);
		}
	}
</style>